Hot air balloon



FIG. 1 is a right front perspective view of a hot air balloon showing our new design;

FIG. 2 is a front elevational view, the rear elevational view being a mirror image thereof;

FIG. 3 is a side elevational view, the opposite side being a mirror image thereof;

FIG. 4 is a top plan view thereof; and,

FIG. 5 is a bottom plan view thereof.

The indicia and decorative elements depicted by broken lines in the figures form no part of the claimed design.

The basket and occupants depicted by broken lines in the drawing represent environment and form no part of the claimed design. 

CLAIM The ornamental design for a hot air balloon, as shown and described. 